Pajamas (formerly Pajamas before May 2012), is a rich Internet application framework for developing client-side web and desktop applications in Python. The resulting applications can be run in a web browser or as standalone desktop applications. It contains a stand-alone Python-to-JavaScript compiler, an Ajax framework and a widget toolkit, and through use of these components, developers can write comprehensive applications, to run in all major web browsers, without writing any JavaScript. Pyjs is a port of the Google Web Toolkit (GWT) from Java to Python.
Using pyjs, developers can write web applications in Python instead of JavaScript. The application is compiled to JavaScript. Also included is an Ajax library and widget set that provides access to the Document Object Model (DOM) of modern JavaScript-capable web browsers. The Ajax library and the widget set are a hybrid mix of Python and JavaScript. Just as with Google Web Toolkit, it’s not its libraries, and neither is it just another Ajax framework. Ajax frameworks are strictly limited to providing pre-prepared specific functionality, written almost exclusively in tailor-made JavaScript. Both GWT and pyjs, being JavaScript compilers, allow the developer to work in which they are familiar (Java or Python, respectively), to write their own custom widgets, full width of the modern widgets. So, far from presenting web developers with made-done Ajax framework, pajs gives you freedom to develop your own.
The pythians compile is written in the programming language Python, and uses it to compile its input into JavaScript, walking the abstract syntax tree of the program being compiled. Although the compiler is stand-alone, the primary use of pyjs is for web development, so there is additional infrastructure for building web applications. The DOM.py model library is an abstraction layer – a thin layer of Python on top of JavaScript code snippets As with any compiler, the JavaScript snippets are treated as inline assembler. In addition, the top of the DOM.py model library is an additional abstraction layer, ui.py, which provides the most useful layer to web developers: a full suite of widgets with which desktop application developers will be familiar.
The major Pyjs components include:
The widget set library that comes with pyjs is so similar to PyQt and PyGTK that it was made to run on the desktop, called Desktop Pyjs (formerly PyjamasDesktop before May 2012 and originally hosted separately prior to version 0.6). The project uses Webkit, XULRunner or MSHTML as the underlying technology, and it is through these browser engines that manipulate the DOM model of the application. Together for the desktop and cross-platform allow cross-platform, cross-desktop, cross-browser and cross-widget applications that run on the web and on the desktop.
Pajamas was started by James Tauber as a port of the UI Widget Set and the DOM support libraries from Google Web Toolkit to the Python language. Tauber then wrote the original pyjs compile. In 2008, Luke Leighton took over the project, updated the UI Widget Set, and compiled the Desktop Runtime. Bernd Dorn and his colleagues from Lovely Systems did some dramatic compiler improvements released in version 0.5. Kees Bos is responsible for the majority of improvements and the enhanced Python interoperability in the compiler, such as the yielding keyword support and long data types. C Anthony Risinger also joined the lead and administrator of the project. In 2012, the project was driven by an extensive community, but on May 2, due to disagreements between project leaders, some members created at pajamas fork. This new team created pyjs.org, led by Anthony Risinger and the person who owned the domain. Meanwhile, Luke Leighton continues to work on his own path and continues to work on this. There was controversy over the publication of the mailing list of the Google Groups. This is a violation of the UK’s Data Protection Act by Luke Leighton. Whether this is actually a violation is not really clear and is open to interpretation. This was a community driven open source project. According to many in the community, both Luke and Anthony were co-administrators of the project and co-leads to it. Anthony, one of the administrators who had been privileged for the server, which Luke Leighton owned. The mailing list was part of the domain. So the ownership of the mailing list is not very clear. Though Luke claims he personally owned the mailing list and he is using it to create a new mailing list for the new pyjs.org Luke Leighton was a co-lead and co-administrator. Hence the mailing list was actually a community property of the pyjs.org community and not the personal property of Luke. Even though the membership of the mailing list is not entirely clear, the action was taken by the maintainers of the new countries. org fork to remove everyone from the new google groups and invite all members to voluntarily join the new google groups. This is exactly the same approach that Leighton took over when he was in the lead. The current membership of the Google Groups is now voluntary, created through invitation, and does not violate any privacy and data protection laws. There are no legal issues for this period of time. Both forks have been actively developed and have formed their own communities. This is exactly the same approach that Leighton took over when he was in the lead. The current membership of the Google Groups is now voluntary, created through invitation, and does not violate any privacy and data protection laws. There are no legal issues for this period of time. Both forks have been actively developed and have formed their own communities. This is exactly the same approach that Leighton took over when he was in the lead. The current membership of the Google Groups is now voluntary, created through invitation, and does not violate any privacy and data protection laws. There are no legal issues for this period of time. Both forks have been actively developed and have formed their own communities. The current membership of the Google Groups is now voluntary, created through invitation, and does not violate any privacy and data protection laws. There are no legal issues for this period of time. Both forks have been actively developed and have formed their own communities. The current membership of the Google Groups is now voluntary, created through invitation, and does not violate any privacy and data protection laws. There are no legal issues for this period of time. Both forks have been actively developed and have formed their own communities.
There were two forks of the Pajamas / Pyjs project: one maintained by the new Pyjs team and one maintained by Luke Leighton.
The Pyjs.org fork, has gone through active development.
Pyj.be, continued to be maintained by Luke Leighton and was still active with bug fixes and new development. As of early 2015, however, the website is not available anymore.
Pajamas has been criticized by heavy users for several aspects:
Most alternatives to Pajamas are translators rather than frameworks.
* Pajs Home